<template>
    <div class="login_container">
       <div class="login_box">
           <!-- 头像区域 -->
           <div class="avatar_box">
               <img src="../assets/logo.png" alt="">
           </div>
            <!-- 登录表单区域 -->
           <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
              <!-- 用户名 -->
              <el-form-item prop="username">
                  <el-input prefix-icon="iconfont icon-user" v-model="loginForm.username"   ></el-input>
              </el-form-item>
              <!-- 密码 -->
              <el-form-item prop="password">
                  <el-input prefix-icon="iconfont icon-3702mima" v-model="loginForm.password" type="password"></el-input>
              </el-form-item>
              <!-- 按钮区域 -->
              <el-form-item class="btns">
                <el-button type="primary" @click="login">登录</el-button>
                 <el-button type="info" @click="resetLoginForm">重置</el-button>
              </el-form-item>
           </el-form>
       </div>
    </div>
</template>

<script>
export default {
     data () {
      return {
        // 这是登录表单的数据绑定对象
        loginForm: {
          username: 'admin',
          password: '123456'
        },
         // 表单验证规则
        loginFormRules: {
          username: [
            { required: true, message: '请输入用户名!', trigger: 'blur' },
            { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
          ],
          password: [
            { required: true, message: '请输入密码', trigger: 'blur' },
            { min: 6, max: 15, message: '长度在 7 到 15 个字符', trigger: 'blur' }
          ]
        }
      }
    },
    methods: {
        // 点击重置按钮
      resetLoginForm () {
        //   console.log(this)
        this.$refs.loginFormRef.resetFields()
      },
      login () {
          this.$refs.loginFormRef.validate(async valid => {
              if (!valid) return false
              const { data: res } = await this.$http.post('login', this.loginForm)
              if (res.meta.status !== 200) return this.$message.error('登录失败!!')
               this.$message.success('登录成功!!')
             // 1、将登录成功之后的token,保存到客户端的 sessionStorage中是会话期间的存储机制(因locationStorage持久化存储机制)
             //  1.1、项目中除了登录之外的其他API接口,必须在登录之后才能访问
             //  1.2、token只应在当前网站打开期间生效,所以将token保存在sessionStorage中
             console.log(res)
             window.sessionStorage.setItem('token', res.data.token)
             // 2、通过编程时导航跳转到后台主页,路由地址是 /home
             this.$router.push('/home')
          })
      }
    }
}
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
    position: relative;
}

.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%)
}

.avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #eee;
    img {
        height: 100%;
        width: 100%;
        border-radius: 50%;
        background-color: #eee
    }
}

.btns{
    // 变成一个弹性盒模型
    display: flex;
    // 尾部对齐
    justify-content: flex-end;
}

.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
</style>
